HI Randal,
It is the line coming out of the top of the radiator unless your transmission has an external cooler on it .
Hope I've answered your question, please hit the accept button and I'm looking for positive feed back. Feel free to write me back if you need any more information.
Thanks David
ASE Certified Master Technician
All 8 ASE Certifications/ 25 yrs exp./ Dodge, Chrysler & Jeep Professional